CN102423686B - A kind of modified mordenite adsorbent and preparation method thereof - Google Patents
A kind of modified mordenite adsorbent and preparation method thereof Download PDFInfo
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- CN102423686B CN102423686B CN201110339514.6A CN201110339514A CN102423686B CN 102423686 B CN102423686 B CN 102423686B CN 201110339514 A CN201110339514 A CN 201110339514A CN 102423686 B CN102423686 B CN 102423686B
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- modenite
- mercury
- nitrate
- adsorbent
- roasting
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Abstract
The invention discloses a kind of modified mordenite adsorbent and preparation method thereof, this adsorbent contains modenite, the nitrate of percentage by weight 1-5% and a kind of lanthanide series metal of percentage by weight 0.5% that percentage by weight is 94.5-99.5%, adopt adsorbent prepared by the inventive method, can adsorb the mercury in flue gas at 100-250 DEG C, the adsorption capacity of mercury can reach 584ng/g ~ 897ng/g, there is good applicability, for the control of mercury provides foundation, do not produce secondary pollution simultaneously.
Description
Technical field
The present invention relates to a kind of modified mordenite adsorbent and preparation method thereof, this adsorbent is used for the absorption of high temperature mercury, and it is the adsorbent obtained with preparation after nitrate modified mordenite.
Background technology
Coal-fired mercury pollution is the another large pollution problem after coal-fired sulphur pollution universally acknowledged in recent years, and wherein coal-burning power plant is topmost mercury emissions pollution sources, and the discharge controlling power plant's mercury pollution has become the important issue of environmental protection.In China's energy resource structure, the ratio of coal is up to 75.9%, and the average mercury content of coal is 0.22mg/kg, due to China's coal combustion technology generally backwardness, causes mercury pollution particularly serious.The U.S. expects domestic mercury emissions in 2018 will reduce 69%, and its Ministry of Energy (DOE) have selected the mercury emissions control of 8 new pilot projects for coal-burning power plant for this reason.Requirement has been done according to the minimum mercury emission of coal-fired kind to coal fired power plant by the U.S., and the discharge standard of bituminous coal, subbituminous coal, brown coal is respectively 0.96,2.8 and 4.4ug/MJ.At present, China is still in the starting stage to the control of mercury in coal-fired plant flue gas, and there is no concrete mercury emissions restriction, only in " new pollution sources Air Pollutant Emission limit value ", the highest permission concentration of emission of regulation mercury and mercuric compounds is 0.012mg/m
3.
In coal combustion process mercury discharge and control and the fractions distribution of mercury in flue gas have important contacting.The control of mercury pollution in eighties of last century to begin one's study coal-fired process the beginning of the nineties at the end of the eighties abroad, mainly lays particular emphasis on the total concentration analysis of Mercury In Coal Combustion Flue Gas, the researchs such as the fractions distribution of mercury in flue gas, Transport.The existence form of Mercury In Coal Combustion Flue Gas has Elemental Mercury (Hg
0), bivalent mercury (Hg
2+) and particle mercury (Hg
p) 3 kinds.Due to the high temperature in combustion furnace, most mercury is all broken down into Elemental Mercury and is present in a gaseous form in flue gas.Gaseous state bivalent mercury is soluble in water, easily catch by wet scrubbing system and remove; Particle mercury is easily by removals such as electric cleaners; And Elemental Mercury volatility is high and be insoluble in water, it is relatively stable form.
From the control discharge technical research of current mercury, mainly concentrate on three aspects: demercuration and the rear demercuration of burning in the front demercuration of burning, burning.Although coal-washing technique can remove a part of mercury in coal before burning, the emission problem of mercury can not be solved completely; In burning, demercuration research is less, makes mercury formation be easy to the form trapped, simultaneously for NO mainly through improving reactor and controlling suitable ignition temperature
x, SO
xand some combustion control technologies taked may have positive effect to removing of mercury; And demercuration may be the major way that Future Power Plant mercury pollution controls after burning, if after future emission standards improves, if existing pollution control equipment can be utilized, force the Forms Transformation carrying out mercury, make it change into be easy to the form controlling to remove, walk the road of combined type Environmental capacity, enterprise is had to the meaning of reality.Carried out a series of research in this respect abroad, on the one hand from the control method concerning mercury, main research is added absorbent and to be absorbed or adsorptive gaseous element mercury is removed to make it be able to sedimentation.As with spraying into charcoal absorption, flying dust, calcium base class adsorbent, comprise the exploitation of the adsorbent such as zeolite, kaolin removal of mercury technology and the experimental study of adsorption process physical-chemical reaction characteristic.On the other hand, the Controlling Technology of mercury pollution control is mainly studied before or after particulate control device, sprays into charcoal absorption, or adopt discharge flue gas again through the research of an ADSORPTION IN A FIXED BED bed.Although make some progress, but still face many technical problems, although as better in sprayed into active carbon adsorption effect, it is expensive, and economic feasibility is not high and application prospect causes anxiety.
Particle mercury (Hg in coal-fired flue-gas
p) content is less, spray into method (SDA) in conjunction with various adsorbent, sack cleaner/electrostatic precipitator (FF/ESP) can remove this part particle mercury effectively.Due to Hg
2+water-soluble, flue gas by after wet desulfurizer (WFGD), Hg
2+removal efficiency can reach 90%, but Hg
0clearance be almost 0, for this reason can by various oxidizing process (such as SCR, chemical oxidization method etc.) first by Hg
0oxidation, then be combined with WFGD, high mercury clearance can be reached.SCR (SCR) and non-selective catalytic reduction (SNCR) are denitration facilities relatively more universal abroad at present, wherein with SCR application at most.Flue gas, by after this denitration facilities exhaust, increases follow-up flue gas desulfurization (FGD) to the removal of mercury by strengthening the oxidation of mercury.
The removal efficiency of active carbon to Mercury In Coal Combustion Flue Gas reaches as high as more than 90%, can improve its utilization rate further, but operating cost is too high through modified; In coal-fired flue-gas, directly inject sulphur, chlorine etc. largely can improve the adsorption rate of flying dust to mercury, flying dust receives increasing concern as a kind of low-cost sorbent removing mercury; Ca-base adsorbent primary attachment Hg
2+, but very low for the adsorption efficiency of Elemental Mercury, be therefore used alone the method and the coal steam-electric plant smoke removal of mercury is had little significance, but cooperation-removal can be carried out in conjunction with oxidizing process simultaneously; Mineral substance adsorbent economy is high, and clearance is low, should select activating agent modification in conjunction with the characteristic of itself; There is the new adsorbent of larger adsorption capacity and power of regeneration, because it is higher to the regulate expenditure of mercury, notice should be put in the research of its power of regeneration.
Patent of invention CN1262148A discloses a kind of modenite and porous metal composite material, and it contains Lacunaris metal carrier and the modenite of direct crystallization on this Lacunaris metal carrier.Can be used as various Hydrocarban coversion catalysts through modified, as the catalyst of the processes such as catalytic cracking, hydrotreatment, isomerization, alkylation, also can be used as the activity composition of denitrifying oxide catalyst.
Patent of invention CN1156642A disclose a kind of containing modenite, cerium and at least one the VIIIth the catalyst of metal of race for the isomerized method of aromatic C 8 cut.
Patent of invention CN101357322A discloses a kind of preparation method of transition metal compound loaded vermiculite absorbent, and it is mainly used in Hg under normal temperature (25 DEG C-35 DEG C) environment
0absorption.Can be used for the adsorption cleaning of micro-gaseous elemental mercury in coal-fired flue-gas and other industrial waste gases.
Patent of invention CN101301602A has invented a kind of preparation method of gaseous mercury absorbing and purifying agent.It is that transistion metal compound and hydrochloric acid etc. mix in proportion by vermiculite original soil, dipping, obtains being applicable to Elemental Mercury (< 100ug/m under normal temperature
3) tail gas clean-up.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of modified mordenite adsorbent, this carries out modified with various nitrate to modenite, obtains the adsorbent containing a small amount of lanthanide series metal.Take modenite as raw material, on the one hand Hg
0and Hg
2+adsorb simultaneously; Metal oxide on the other hand on modenite and lanthanide series metal can directly by Hg
0be oxidized to Hg
2+, thus be more conducive to the absorption to mercury.
In the present invention, preparation method implements according to the following steps:
1) by drying and crushing after modenite flotation removal of impurities, granularity≤0.075mm is ground to;
2) repeatedly exchanged by the modenite weak acid and weak base solution after grinding, washing, dry, roasting, the mixed proportion of modenite and weak acid and weak base is volume ratio 1:10-20;
3) being that the red fuming nitric acid (RFNA) deionized water of 65-70% is diluted to 20-30% by commercial concentration, is that 0.045-0.075mm nitrate granules mixes subsequently with granularity; After nitrate dissolves completely, add step 2) modenite of gained, dipping, dry, modenite is dissolved completely again by deionized water, flood after finally adding a kind of lanthanide series metal, dry, wherein after lanthanide series metal, nitrate granules, modenite and dilution, nitric acid weight ratio is 1:2-10:10-200:20-700;
4) subsequently material is placed in tube furnace 110-250 DEG C of roasting 4h, takes out and be ground to 0.025mm, be again placed in tube furnace roasting 4h again under identical temperature conditions, obtain modified mordenite adsorbent, be placed in drier for subsequent use.
In the present invention, modenite used is commercially available common aperture modenite, and main component is SiO
251% ~ 67%, Al
2o
315% ~ 19%, CO
26% ~ 31%, CaO13% ~ 29%, Na
2o2% ~ 9%, K
2o2% ~ 4%, Fe
2o31% ~ 5%.
The solution of weak acid and weak base described in the present invention is the NH of 0.1 ~ 1mol/L
4ac, NH
4nO
3, a kind of in ammonia spirit.
After the weak acid and weak base of modenite described in the present invention solution carries out the exchange of 2-3 secondary ion, washing under 60 ~ 95 DEG C of conditions, to be positioned in baking oven under 60 DEG C of conditions dry 2 hours, to pass into the roasting 4 hours under tube furnace 200 DEG C of conditions of protection gas nitrogen.
Nitrate described in the present invention is copper nitrate, ferric nitrate, cerous nitrate, the one in manganese nitrate.
In step 3) described in the present invention, dip time is 6-10h, baking temperature 60 DEG C-90 DEG C, time 2-4h.
Another object of the present invention is to provide a kind of modified mordenite adsorbent, and adsorbent contains the modenite of percentage by weight 94.5-99.5%, the nitrate of percentage by weight 1-5% and a kind of lanthanide series metal of percentage by weight 0.5%.
Show when adsorption temp is 100-250 DEG C, to be about 34.8ug/m to mercury content by the adsorbent that described method is obtained by practical study
3coal-fired flue-gas carry out mercury absorption, the adsorption capacity of mercury can reach 584ng/g-897ng/g, and unmodified modenite when 100-250 DEG C to elemental mercury from coal-fired flue gas almost without adsorption capacity.High temperature is disadvantageous to charcoal absorption mercury, lower than 100 DEG C during the optimal adsorption temperature of active carbon, and actual coal-fired flue-gas exhaust temperature after UTILIZATION OF VESIDUAL HEAT IN is about 100-250 DEG C, so the adsorbent specific activity charcoal that this method obtains has better applicability, modified adsorption effect is also higher.Adsorbent in the present invention is applicable to the adsorption cleaning of mercury in high temperature coal flue gas and other industrial waste gases, as coal-burning power plant, garbage burning boiler and some Chemical Manufacture producers.
Below in conjunction with embodiment, the present invention is described in further detail.
Detailed description of the invention
Embodiment 1: the preparation method of this modified mordenite adsorbent is SiO by chemical component weight percentage
261%, Al
2o
316%, CO
210%, CaO20%, Na
2o5%, K
2o2%, Fe
2o
3drying and crushing after the modenite flotation removal of impurities of 4%, is ground to 0.05mm.Use 0.1mol/LNH
4ac120mL and volume are that the modenite of 6ml mixes, and when temperature is 60 DEG C, stir 4h, filter, repeat 2 times; With distilled water washing repeatedly, until pH=7, to be positioned in baking oven under 60 DEG C of conditions dry 2 hours, to pass into the roasting 4 hours under tube furnace 200 DEG C of conditions of protection gas nitrogen; By deionized water by 65% dense HNO
3be diluted to the nitric acid of 20% concentration, be that O.05g the manganese nitrate of 0.045mm adds in 0.5 gram of 20% nitric acid and be uniformly mixed by granularity, make it fully dissolve; While stirring, slowly add modenite 5g, stir, dipping 6h, 60 DEG C of dry 4h; The 5g modenite deionized water 15mL of gained is after treatment dissolved completely, add 0.025g lanthanoid metal, abundant stirring makes it even, dipping 10h, 60 DEG C of dry 4h, material 250 DEG C of roasting 2h in tube furnace after finally flooding, take out and be ground to 0.025mm, again be placed in tube furnace roasting 2h again under 250 DEG C of conditions, obtain modified mordenite adsorbent finished product.
The modified mordenite adsorbent obtained in the present embodiment and modenite original soil adsorbent ability are contrasted, adsorption conditions is flue gas flow is 500ml/min, and adsorption temp is 250 DEG C, and mercury in flue gas content is about 34.8 μ g/m
3, experimental result shows, and modenite original soil adsorption capacity when 30min is 33ng/g, and modified modenite adsorption capacity when 30min is 590ng/g, is 17.9 times of unmodified modenite adsorption capacity.
Embodiment 2: the preparation method of this modified mordenite adsorbent is SiO by chemical component weight percentage
256%, Al
2o
316%, CO
27%, CaO18%, Na
2o5%, K
2o2%, Fe
2o
3drying and crushing after the modenite flotation removal of impurities of 5%, is ground to 0.075mm.Use 0.5mol/LNH
4nO
3100mL and volume are that the modenite of 6ml mixes, and when temperature is 95 DEG C, stir 4h, filter, repeat 2 times, wash repeatedly with distilled water, until pH=7, to be positioned in baking oven under 60 DEG C of conditions dry 2 hours, to pass into the roasting 4 hours under tube furnace 200 DEG C of conditions of protection gas nitrogen; By deionized water by 70% dense HNO
3be diluted to the nitric acid of 30% concentration, be that O.4g to add 28g concentration be uniformly mixed in the nitric acid of 30% for the six nitric hydrate copper of 0.045mm by granularity, make it fully dissolve; Slowly add modenite O.4g, stir, dipping 6h, 60 DEG C of dry 4h, remove ionized water 1.2mL will O.4g dissolve completely by modenite, add 0.04g metal gadolinium, fully stir and make it even, dipping 8h, 80 DEG C of dry 3h, subsequently 110 DEG C of roasting 4h in tube furnace, take out and be ground to 0.025mm, again be placed in tube furnace roasting 4h again under 110 DEG C of conditions, obtain adsorbent finished product.It is 500ml/min that the adsorbent that the present embodiment is obtained is used for flue gas flow, and mercury content is about 34.8 μ g/m
3, adsorption temp is in the experiment of 200 DEG C, and result display 30min is that 595ng/g, 60min can reach 688ng/g to the adsorption capacity of mercury to the adsorption capacity of mercury.
Embodiment 3: the preparation method of this modified mordenite adsorbent is SiO by chemical component weight percentage
265%, Al
2o
318%, CO
220%, CaO25%, Na
2o3%, K
2o3%, Fe
2o
3drying and crushing after the modenite flotation removal of impurities of 3%, is ground to 0.075mm.Mix with the modenite that 1mol/L ammoniacal liquor 120mL and volume are 12ml, stir 4h when temperature is 80 DEG C, filter, repeats 3 times, wash repeatedly with distilled water, until pH=7,100 DEG C of dry 5h, 250 DEG C of roasting 2h.By deionized water by 70% dense HNO
3be diluted to the nitric acid of 25%, be that to add 100g concentration be uniformly mixed in the nitric acid of 25% for the ferric nitrate 6g of 0.06mm by granularity, make it fully dissolve; Slowly add modenite 50g, stir, dipping 6h, 60 DEG C of dry 4h, remove ionized water 150mL and are dissolved completely by 50g adsorbent, add 1g metal gadolinium, abundant stirring makes it even, dipping 6h, 90 DEG C of dry 2h, 200 DEG C of roasting 3h in tube furnace subsequently, take out grinding 0.025mm, be again placed in tube furnace roasting 3h again under 200 DEG C of conditions, obtain adsorbent finished product, it is 500ml/min that the adsorbent that the present embodiment is obtained is used for flue gas flow, and mercury content is about 34.8 μ g/m
3, adsorption temp is in the experiment of 200 DEG C, and result display 30min is that 589ng/g, 60min can reach 788ng/g to the adsorption capacity of mercury to the adsorption capacity of mercury.
Claims (3)
1. a preparation method for modified mordenite adsorbent, is characterized in that carrying out as follows:
1) by drying and crushing after modenite flotation removal of impurities, granularity≤0.075mm is ground to;
2) the modenite weak acid after grinding or weak caustic solution carried out exchanging, wash, dry and roasting, the mixed proportion of modenite and weak acid or weak base is volume ratio 1:10-20;
3) being that the red fuming nitric acid (RFNA) deionized water of 65-70% is diluted to 20-30% by commercial concentration, is then that 0.045-0.075mm nitrate granules mixes with granularity; After nitrate dissolves completely, add step 2) modenite of gained, dipping, after drying, deionized water is added again in modenite, flood after finally adding a kind of lanthanide series metal, dry, wherein after lanthanide series metal, nitrate granules, modenite and dilution, nitric acid weight ratio is 1:2-10:10-200:20-700;
4) finally material is placed in tube furnace 110-250 DEG C of roasting 2-4h, takes out and be ground to 0.025mm, be again placed in tube furnace roasting 2-4h again under identical temperature conditions, obtain modified mordenite adsorbent, be placed in drier for subsequent use;
Described nitrate is copper nitrate, ferric nitrate, cerous nitrate, the one in manganese nitrate;
Described lanthanide series metal is lanthanoid metal or metal gadolinium;
Described weak acid solution is the NH of 0.1 ~ 1mol/L
4nO
3solution, weak caustic solution is the ammonia spirit of 0.1 ~ 1mol/L.
2. preparation method according to claim 1; after it is characterized in that modenite weak acid or weak caustic solution carry out the exchange of 2-3 secondary ion, washing under 60 ~ 95 DEG C of conditions; to be positioned in baking oven under 60 DEG C of conditions dry 2 hours; pass into protection gas nitrogen, roasting 4 hours under tube furnace 200 DEG C of conditions.
3. preparation method according to claim 1, is characterized in that in step 3), lanthanide series metal dip time is 6-10h, baking temperature 60 DEG C-90 DEG C, time 2-4h.
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| CN102423686B true CN102423686B (en) | 2016-02-03 |
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| CN108926957B (en) * | 2018-08-07 | 2021-06-04 | 杭州野光环保科技有限公司 | Gas adsorption device |
| CN111408340A (en) * | 2020-04-02 | 2020-07-14 | 北京万义节能环保科技有限公司 | Acidic waste gas adsorbent and preparation method thereof |
| CN114259978B (en) * | 2021-12-27 | 2023-12-01 | 杭州电子科技大学 | Preparation process of efficient coal-fired flue gas mercury removal adsorbent and product thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106921A (en) * | 1986-10-23 | 1988-05-04 | 核工业部北京第五研究所 | Synthesizing of a kind of modified zeolite |
| CN1262148A (en) * | 1999-01-25 | 2000-08-09 | 中国石油化工集团公司 | Composite material containing mordenite and porous metal and preparing process thereof |
| CN1673106A (en) * | 2005-01-27 | 2005-09-28 | 桂林矿产地质研究院 | Modified red stilbite water cleaning agent |
| EP1985362A1 (en) * | 2007-04-26 | 2008-10-29 | BP Chemicals Limited | Process for the carbonylation of dimethyl ether |
-
2011
- 2011-11-01 CN CN201110339514.6A patent/CN102423686B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106921A (en) * | 1986-10-23 | 1988-05-04 | 核工业部北京第五研究所 | Synthesizing of a kind of modified zeolite |
| CN1262148A (en) * | 1999-01-25 | 2000-08-09 | 中国石油化工集团公司 | Composite material containing mordenite and porous metal and preparing process thereof |
| CN1673106A (en) * | 2005-01-27 | 2005-09-28 | 桂林矿产地质研究院 | Modified red stilbite water cleaning agent |
| EP1985362A1 (en) * | 2007-04-26 | 2008-10-29 | BP Chemicals Limited | Process for the carbonylation of dimethyl ether |
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